Ping?
Thanks,
Corinna
On Jul 6 16:51, Corinna Vinschen wrote:
> On Jul 6 12:27, Corinna Vinschen wrote:
> > Hi,
> >
> >
> > while working on Cygwin's new sigaltstack implementation, I wrote
> > a testcase which I intended to share with my main tester. Since
> > we're trying to debug, we build without optimization. Now, this
> > is looking closely at what happens to the stack, so I need access
> > to the TEB. Here's what happens:
> >
> > $ cat foo.c
> > #include <windows.h>
> >
> > int
> > main ()
> > {
> > MEMORY_BASIC_INFORMATION m;
> > NT_TIB *tib = (NT_TIB *) NtCurrentTeb ();
> > VirtualQuery (tib, &m, sizeof m);
> > }
> > $ gcc -g -O foo.c -o foo
> > $ gcc -g foo.c -o foo
> > /tmp/ccnnAEl3.o: In function `main':
> > /home/corinna/foo.c:7: undefined reference to `NtCurrentTeb'
> > collect2: error: ld returned 1 exit status
> >
> > There's no way around that, except for builindg with optimization, which
> > is often not prudent when debugging.
> >
> > In winnt.h, NtCurrentTeb is using __CRT_INLINE which, depending on C
> > standard, expandes into
> >
> > extern inline __attribute__((__gnu_inline__))
> >
> > or
> >
> > extern __inline__
> >
> > However, that's not sufficient for NtCurrentTeb (nor, fwiw,
> > GetCurrentFiber() etc.) since they are not backed by non-inlined
> > versions. Linking against ntdll doesn't help.
> >
> > So, shouldn't these inline functions use the __always_inline__
> > attribute? Or, maybe better, shouldn't __CRT_INLINE use the
> > __always_inline__ attribute when built on GCC?
>
> Btw., this problem seems to exist on 32 bit x86. The x86_64
> code uses FORCEINLINE which apparently inlines even without
> optimization.
>
>
> Corinna
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